[cfe-dev] How to get the string from the CFGStmt

Manuel Klimek klimek at google.com
Fri Feb 17 08:51:14 PST 2012

On Fri, Feb 17, 2012 at 5:42 PM, redder_0210 <redder_0210 at yeah.net> wrote:
> I want to do something to the CFG of Clang. Now I can get the CFG of the C
> File.

What do you call to get the CFG of the C file? Can you point to your program?


> AfterI got the CFG, I can get the Stmt of the CFG.Now the question is that
> how I can get the SourceManager through the CFG.
> At 2012-02-17 17:10:40,"Manuel Klimek" <klimek at google.com> wrote:
>>On Fri, Feb 17, 2012 at 10:05 AM, redder_0210 <redder_0210 at yeah.net> wrote:
>>> Thanks for you replying.
>>> The new question is that I cannot get the SourceManager only by the Stmt.
>>> So
>>> the "SM.getSpellingLoc(Range.getBegin())" cannot work.
>>> Thus, I want to how to get SourceManager from the Stmt or from the
>>> SourceRange.
>>You can't. You need to get the SourceManager from the context. I could
>>help you more if you give a little more context on how you're hooking
>>into clang.
>>> Hope Best!
>>> /Redder
>>> At 2012-02-13 17:25:26,"Manuel Klimek" <klimek at google.com> wrote:
>>>>On Mon, Feb 13, 2012 at 5:48 AM, redder_0210 <redder_0210 at yeah.net>
>>>> wrote:
>>>>> Dear all,
>>>>> I am interested in that how to translate from a statemnt to the
>>>>> corresponding string.
>>>>> For example,
>>>>> in the CFG, there is a CFGStmt "int i = 0;",
>>>>> now I want to get the string "int i = 0;",namely modify the type
>>>>> CFGStmt
>>>>> to
>>>>> the type string.
>>>>CFGStmt has a getStmt() which gets you a Stmt, which has a function
>>>>getSourceRange which gives you the SourceRange.
>>>>When you have a SourceRange you can get a CharSourceRange by calling
>>>>Then you get the start location by calling
>>>>SM.getSpellingLoc(Range.getBegin()) (where Range is the
>>>>You can calculate the length of the text by calling getDecomposedLoc
>>>>on the getBegin() and getEnd() of the spelling locations. You'll also
>>>>need to add Lexer::MeasureTokenLength(EndLocation, ...) to the size,
>>>>as the last element of a token range points to the begin of the last
>>>>Finally you can call SM.getCharacterData with the begin and you'll
>>>>have your text.
>>>>Unfortunately this is a little harder than it could be, mostly due to
>>>>the different types of locations. (Note that if there are for example
>>>>macros involved, it matters whether you use getSpellingLocation or

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